Control system.



H. H. JOHNSTON.

CONTROL SYSTEM.

APPLICATION FILED r53. :3. 19m 7 Patented Feb. 11, 1919.

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ATToRNEY H. H. JOHNSTON.

CONTROL SYSTEM.

APPLICATION mm FEB. 1a. 1911;

Paientea Feb.11,1919.

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UNITED STATES PATENT OFFICE.-

HOWARD H. JOHNSTON, 0F EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR. TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

CONTROL SYSTEM.

Patented Feb. 11, 1919.

Application filed February 13, 1917. Serial No. 148,382.

To all whom it may concern:

Be it known that I HOWARD H. J OHNSTON', a citizen of the Unlted States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Control Systems,'of which the following is a specification.

My invention relates to control systems and particularly to control systems for electric mining locomotives.

One object of my invention is to provide two auxiliary control systems for two mining locomotives which shall severally operate the motors of each locomotive in series and in parallel-circuit relation and jointly operate all of the motors in series-parallel and in parallel-circuit relation.

Another object of my invention is to provide a control system for each of two groups of motors which shall severally connect the groups of motors across a supply circult and operate the motors in series and in parallel-circuit relation, jointly connect the two groups of motors across the supply circuit and operate the motors in series-parallelcircuit relation by means of the controlling apparatus contained in one of the control systems, and jointly control the operation of all motors in parallel-circuit relation by the control apparatus contained in one of the control systems.

In the operation of mining properties, it is very desirable to provide mining locomotives which may be operated as single units or be connected together and operated in tandem, accordin to the work that is required of them. According to my invention, each of two locomotives is provided with auxiliary control systems for severally operating the two locomotive units, and the auxiliary control system of one of the units is provided with means for combining the two auxiliary systems, whereby the motors of the two locomotive units may be operated in series-parallel and in parallel-circuit relation by means of the control apparatus contained in one of the auxiliary systems.

In the accompanying drawings, Figure 1 is a dia 'ra'mmatic view of a control system embodylng my invention; Fig. 2 is a side elevational view of two locomotive units which may be operated by the system illustrated in Fig. 1; Fig. 3 is a chart illustrating the sequence of operation of the switches sistors 4, 5, 6 and 7, switches 8, 9, 1O, 11

and 12 for controlling the operation of the resistors 5, 6 and 7, two switches 13 and 14 for connecting the motors in various relations, two line switches LS1 and LS2, and a segment 15 of a control drum 16 for connecting the motors across a supply circuit embodying a trolley conductor 17 and a ground-return conductor 9. The auxiliary control system 1 also embodies movable contact segments 18, 19 and 20 of the controller 16, which are adapted to connect the auxiliary control systems 1 and 2. reversing switch RS1 of a well-known type is provided for reversing the direction of rotation of the motors M1 to M3, inclusive, and a similar reversing switch RS2 is provided for reversing the direction of rotation of the motors included in the auxiliary control system 2.

The auxiliary control system 2 embodies motors M4, M5 and M6 which may be connected in various circuit relations across the supply circuit, comprising conductors 17 and g, by means of line switches LS3 and LS4 and switches 13a and 14a. In circuit with the motors M4 to M6, inclusive, are provided resistors 21, 22, 23 and 24 which are shortcircuited in predetermined sequence by switches 25, 26, 27, 28 and 29 and the line switch LS4.

The two locomotive units 30 and 31, illustrated in Fig. 2 of the drawings, are provided withdriving wheels 32 and 33 which are respectively propelled by means of the motors M1 M2 and M3 and the motors M4, M5 and M6.

Referring to Fig. 4 0f the drawings, two associate systems 34 and 35, which are connected together by means of the connectors 36, are respectively provided for governing the operation of the switches illustrated in the auxiliary control systems 1 and 2. The control system 34 embodies a master controller MCl, a master reverser MR1, a twopole double-throw switch 37, a. drum controller 16 and the conductors 39 to 52, inelusive.

The master controller M01 embodies two movable contact segments and 5% which are adapted to engage the contact fingers 55 to 62, inclusive, for controlling'the energization of the coils of the switches LS1, LS2 and the switches 8 to 14, inclusive.

The master reverser'MRl embodies mova'blecontact segments 63 to 68, inclusive, which are adapted to engage the contact fingers 69 to 76, inclusive, when moved in a forward and in a reverse direction for controlling the operation of the reversing switch RS and for preparing the system for operating the motors in a forward or in a reverse direction; Two interlock switches 7 7 and 78 of a well-known type are provided for controlling: the operation of the reversing coils f and 7 that govern the operation of the reversing switch BS1. The control drum 16, which is controlled by means of coils 7 9 and 80,-embodies two movable contact segments 81 and 82 which-are ada ited to engage the contact fingers 83 and 8 inclusive, when moved to the series position, the contact segments 18,19'and 20, which are adapted to-engage the contact fingers'88 to 93', inclusive,'when the controller is moved to the series position, andthe movable contact segment: 15, which isadapted toengage the contact fingers 9i and 95 when the controller is movedto; the parallel position.

The line switch LS1 is provided with an interlock switch LS1-in which is closed when the line switch is operated, and the switch 9 isprovided with an interlock switch 9inwhich is closed when the switch 9 is operated. A resistor 96 is connected across thesupply conductors 17* and g by means of the master controller M01 and is adapted to supply energy for operating the coils of the various switches by means ofthe taps extending: therefrom. The switch 37 when closed in the tandem position, is adapted to connect the contact terminals 97 and 98, and,

when closed in the single operating position,

is adapted to bridge contact terminals 99 and.100;'

The control system 35 is provided with a master controller M62 and a master reverser MR2 whichare similar in construction to the master controller MCI and the master and the switch 26 is provided with an interlock switch 26-in which is operated when the switch 26, is operated. The master reverser MR2 and two interlock switches 103 and, 104i govern the energization of'two coils f1 and r1 to control the operation of the reversing switch RS2.

As the motors M1 to M3, inclusive, and the motors-MitoM6, inclusive, are operated in series and in parallel-circuit relation in a similar manner, the series and parallel operation of: motors M1 to M3, inclusive, only, will beset forth in detail. In case it is de sired to operate the motors M1 to M3, inclusive,in series relation, the switch 37 is closed in: the single operating position; the master reverseris moved to position a, or the series position, and the master controller is moved to position 0;.

In position a of the master controller, acircuit is completed from the trolley conductor 17, through contact fingers 61 and 62--which are bridged by thecontact segment 5 i-rconductor 39 and the resistor 96 to the ground conductor 9; A circuit is formed in shuntto a portion ofthe resistor 96 which may be traced from one tap oftheresistor 96, through'the conductor- 48 to a contact point 110, where the circuit divides, One branch extends through the contact fingers 58 and which are bridged'by the contact segment 53-conductor 4:0, and the coil of theswitch 8 to another tap of the resistor 96, and the second branch extends through contact terminals 99 and 100- which are bridged by'the switch 3-7:and the coil 79 of the change-over controller 16 to the otl'ierterminal of the resistor 96-.

In position a of the master reverser MR1, a circuit completed through the coil ofthe line switchLSll which may be tracedfrom a tap of the resistor 96' through the coil ofthe line switch LS1, inter-lock switch 77, contact finger 75, and the movable-contact segments 67 and 68 to the ground return conductor 9. Thus, the switches LS1 and 8 are operated and the coil 79 of the change-over controller is energized to move the change-over controller 16. to its parallel position and to connect the motors M1 to M8, inclusive, in series relation across the supply conductors 17' and g The circuit through the motors may betr-acedfromthe supply conductor- 17 through'the line switch LS1; resistor i, switch 8-,resistors 5, 6- and 7, meters M1, M2- and M3, andthe contact segmcnt 15 to the ground conductor 9.

When the master controller MCl is moved to position b, the coil of the line switch LS2 is energized by a circuit which may be traced from one tap: of the resistor 96 through the conductor 48, contact fingers 58 and 57whiich arch-ridged by the con tact segment 53cond=uctor 9C2", interlock switch LSL in, and the coil of the line .ries operation of the motors.

switch LS2 to another tap of the resistor 96. The line switch LS2 is operated to exclude the resistor 4 from the circuit of the motors M1 to M3, inclusive. In positions 0, d, e and 7 of the master controller 11101, the switches 11, 9, 10 and 12 are successively operated to exclude the resistors 5, 6 and 7 from the cir cuit of the motors M1 to M3, inclusive.

In case it is desired to operate the motors M1 to M3, inclusive, in parallel-circuit re lation and in a forward direction, the master controller MCI is returned to the off po sition, and the master reverser MR1 is moved to position I), or the forward parallel position. The master controller MCl is then moved to a position a and the resistor 96 is connected across the supply conductors 17 and g, as was described in setting forth the series operation of the motors. A circuit is completed through the coils of the switches 13 and 14, which may be traced from a. tap extending from the resistor 96 through the conductor 48, contact fingers 72, 73 and 7 twhich are bridged by the contact segment -and in parallel through the conductors 4:5 and 4:6 and the coils of the switches 13 and 1% to a second tap of the resistor 96. The coils of the line switch LS1. and of the switch 8 are energized by circuits similar to those traced in describing the se- Thus, the switches LS1, 8, 13 and 14 are operated to connect the motors M1 to M3, inclusive. in parallel relation across the supply conductors 17 and g.

In position b of the master controller, the line switch LS2 is operated to exclude the resistor 1 from the circuit of the motors, and, in positions 0, d, e and f, the switches 11, 9, 10 and 12 are operated to exclude the resistors 5, 6 and 7 from the circuit of the motors. In operating the motors M1 to M3, inclusive, in a reverse direction, the master reverser MR1 is moved through positions a and b- In case it is desired to operate the two locomotive units 30 and 31 in tandem and the motors M1 to M6, inclusive, in seriesparallel-circuit relation, the switch 37 is closed in the tandem position, the master reverser MR1 is moved to position a, and the master controller MCl is moved to position a. A circuit is completed through the resistors 96 and 102, which may be traced from the supply conductor 17 to the contact fingers 61 and 62which are bridged by the contact segment 54to a contact point 111, Where the circuit divides, one branch extending through the resistor 96 to the ground conductor 9, and the second branch extend ing through the conductors 39 and 39a and the resistor 102 to the ground-return conductor g. A circuit is completed through the series coil 80 of the change-over control 16,

which may be traced from a tap of the re sistor 96 through conductor 18, contact fingers and 7lwhich are bridged by the contact segment 63contact terminals 97 and 98which' are bridged by the switch 37conductor 47, and the coil 80 to another tap of the resistor 96. A circuit is completed through the coil of the line switch LS1which may be traced from a tap of the resistor 96tl1rough the coil of the line switch LS1, interlock switch 77, contact finger 75, and the contact segments 67 and 68 to the ground conductor 9. The coil of the switch 8 is operated by a circuit which may be traced from a tap of the resistor 96 through the conductor 48, contact fingers 58 and 60-which are bridged by the movable contact segment 53conductor 40, and the coil of the switch 8 to a second tap of the resistor 96.

When the coil 80 is energized, the changeover controller 16 is moved to its series position and a circuit is completed from a tap of the resistor 96 through contact terminals 83 and 84which are bridged by the contact segment 81-a nd the coil of the switch 13 to a second tap of the resistors 96. A similar circuit is completed from the resistor 102 through the contact fingers 83 and 8% and the contact segment 81 for energizing the coil of the switch 13a. The bridging of the contact fingers 83 and 85 by the contact se ment 81 completes a circuitthrough the coils of the switches 14 and 14a, but the closing of the switch 1% at this time is not essential to the operation of the motors in series-parallel-circuit relation. The bridg ing of the contact fingers 86 and 87 by the contact segment 82 or the change-over controller completes a circuit through the coil of the shunt relay 101, which may be traced from the supply conductor 17 through the contact fingers 86 and 87which are bridged by the contact segment 82conducto-rs 50 and 50a, coil of the relay 101, and a resistor 112 to the ground-return conductor 9. Thus, the relay 101 is operated to prevent the energization of the coils of the line switches LS3 and LS1 simultaneously with the energization of the coils of the line switches LS1 and LS2. Thus, the switches LS1, 8, 13, 13a, 1st and 14a are operated to connect the motors M1 to M6, inclusive, in series-parallelcircuit relation. The circuit through the motors may be traced from the supply circuit 17 through the switch LS1, resistor 4, switch 8, and resistors 5, 6 and 7, where the circuit divides, one branch extending through the motor M1, switch 18, motor M4, and the switch Hate the ground conductor 9, a second branch extending through the switch 18, motor M2, switch 19, motor M5, and switch 14a to the ground conductor r and a third branch extending through the switch 13', motor M8, switch 20, and the motor M6 to the ground. conductor a In positions 6, 0, cl, 6 and f of the master controller MCI, the switches LS2, 11, 9, 12 and 10 are operated to exclude the resistors 4, 5, 6 and 7 from the circuit of the motors M1 to M3, inclusive.

In case it is desired to operate the motors M1 to M6, inclusive, in parallel by means or the master controller MCl, the switch 37 is maintained in the tandem position, the master reverser is moved to the forward parallel position b, and the master controller M01 is moved to position a. The circuit through the resistors 96 and 102 and the coils of the switches LS1, 8, 13, 14, 25, 13a and 14a is similar to the circuits formed through these members during the series parallel operation of the motors.

A circuit is completed through the coil 79 of the change-over controller 16, which may be traced from a tap of the resistor 96, through the conductor 48, contact fingers 69 and 70-which are bridged by the contact segment 63-conduotor 49, and the coil 79 to a second tap of the resistor 96. Thus the coil 79 is energized and the change-over controller 16 is moved into the parallel position. When the controller 16 is in the parallel position, the contact segment 82 breaks the connection between the contact fingers 86 and 87 so as to prevent the operation of the relay 101. In the released position of the relay10l, a circuit is completed through the coil of the line switch LS3 which may be traced from a tap of the resistor 102 through the coil of the, switch LS3, relay 101, interlock switch 103, conductor 51a, con ductor 51, contact finger and the contact segments 67 and 68 to the ground-return conductor 9. Thus, the switches LS1, 8, 13. 14, LS3, 25, 13a and 14a are operated to connect the motors M1 to M6, inclusive, in parallel-circuit relation across the supply conductors 17 and g.

The circuit through the motors M1 to M3, inclusive, may be traced from the supply conductor 17 through the switch LS1, resistor 4, switch 8 and resistors 5, 6 and 7, where the circuit divides, one branch extending through the motor M1, switch 14, and switch 15 to the ground-return conductor g, a second branch extending through the switch 13, motor M2, switch 14, and the switch 15 to the ground conductor 9, and a third branch extending through the switch 13, motor M3, and the switch 15 to the ground conductor 9. The circuit through the motors M4 to M6, inclusive, may be traced from the supply conductor 17 through the line switch LS3, resistor 24, switch 25 and resistors 21, 22 and 23, where the circuit divides, one branch extending through the motor M4, and the switch 14a to the ground 9, a second branch extending through the motor M5, and switch 140 to the ground-return conductor 9 and a, third branch extending through the switch 13a and the motor M6 to the ground-return conductor g.

In positions 6, c, d, e and f of the master controller MCI, the switches LS2, 11, 9, 10 and 12 are operated to exclude the resistors 4, 5, 6 and 7 from the circuit of the motors M1 to M3, inclusive, and the switches LS4, 28, 26, 27 and 29 are operated to exclude the resistors. 24, 21, 2 2 and 23 from the circuit of the motors M4 to, M6, inclusive.

Modificationsin the system and arrangement and location of parts may be made within the spirit and scope of my inven tion, and such modifications are intended to be covered by the appended claims.

I claim as my invention:

1. In a system of control, the combination with six motors divided into two groups, two auxiliary control systems for operating said motors, and means for severally operating the motors of each group in series and in parallel-circuit relation, of means comprising a controller and a pluraL ity of conductors for joining the two systems and for jointly operating said motors in series-parallel and in parallel-circuit relation,

2. In a system of control, the combination with six motors divided into two equal groups, of; means for operating the motors contained in each group. in series and in parallelcircuit relation, and means for jointly operating all of said motors in series-parallel and in parallel-circuit relation.

3. In a system of control, the combination with a supply circuit, and a plurality of motors divided into. groups, of means for connecting the motors. of each of said groups in series and in parallel-circuit relation across, the supply circuit, and means for jointly connecting the motors of all groups in series-parallel and in parallelcircuit relation across the supply circuit, each of said motor groups having an independent connection to the supply circuit when the motors are jointly operated in parallel-circuit relation.

4. In an electric locomotive, the combination with six motors groups, and an auxiliary control system as,- sociated with each of said groups of motors for operating the motors of each group in series and in parallel-circuit relation, of means for connecting the two auxiliary control systems together to eii'ect a joint op eration of all motors in series-parallel and in parallel-circuit relation.

5. In two locomotive units, the combination with two auxiliary control systems, each. of said systems comprising a plurality of motors, and means for operating the motor contained therein in series and in parallelc1rcu1t relation, of means for connecting the two auxiliary systems together to jointly divided into two operate the motors of the two systems in serles-parallel and in parallel-circuit relation, and means comprising a relay for insuring a ingle connection from the motor to the supply circuit when the motors are operated in series-parallel circuit relation, whereby the two locomotive units may be operated a a single locomotive.

6. In a system of control fortwo locomotive imits, the combination with a supply circuit, a group of motors disposed on each of said locomotive units, and means for operating the motors of each unit in series and in parallel circuit relation, of means for jointly operating the motors of the two units in series-parallel and in parallel-circuit relation and means for insuring a single connection from the motors to the supply circuit when the motors are operated in series-parallel circuit relation.

7. In a system of control, the combination with six motors divided into two equal groups, and a supply circuit for energizing said motors, of means for connecting said motors in series parallel circuit relation across the supply circuit, and means for severally connecting each group of motors to the supply circuit and for operating the motors in parallel-circuit relation.

8. In a system of control, the combination with two groups of motors, a supply circuit, and a controlling means associated with each group of motors for operating the motors in series and in parallel-circuit relation, of means for connecting said groups of motors together and for jointly operating the motors in series-parallel and in parallelcircuit relation by means of one of said controlling means, said motor groups having one connection to the supply circuit when the motors are in series-parallel relation and two connections to the supply circuit when the motors are jointly operated in parallel relation.

9. In a system of control, the combination with two locomotive units, a plurality of motors for each of said units, and controlling means associated with each unit for operating the associated motors in series and in parallel-circuit relation, of means for connecting the motors of the two units together and for jointly operating the mo tors in series-parallel and in parallel-circuit relation and in a forward and in a reverse direction by the controlling means of one of said units.

10. In a system of control, the combination with two groups of motors, a supply circuit, and a controlling means associated with each group of motors for connecting the motors to the supply circuit and for operating the same in series and in parallelcircuit relation, of means for connecting said groups of motors together and for jointly operating the motors in series-parallel and in parallel-circuit relation and in a forward and in a reverse direction by means of one of said controlling means.

In testimony whereof, I have hereunto subscribed my name this 29th day of J anuary, 1917. v

HOWARD H. JOHNSTON.

Copiea of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

